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Relaxation dynamics in the B(1/2) and C(3/2) charge transfer states of XeF in solid Ar
 

Summary: Relaxation dynamics in the B(1/2) and C(3/2) charge transfer states
of XeF in solid Ar
G. J. Hoffman,a) Dan G. Imre, R. Zadoyan, N. Schwentner,b) and V. A. Apkarian@
Department of Chemistry, University of California, Irvine, California 92717
(Received 7 December 1992; accepted 1 March 1993)
Dispersed laser induced fluorescence, and time domain measurements using the optical Kerr
effect are applied to study the relaxation dynamics of Xe+F- (B 281,2 and C211Z12) charge
transfer states in solid Ar. Very fast vibrational relaxation is observed in the C emitting site:
excitation near v=20 leads to population of v=O of the C state in 13( f 2) ps. In the B emitting
site, the lower vibrational states relax sequentially. Relaxation times of 800( f 30) ps for 1+ 0
and 250 ( f 30) ps for 2 -f 1, are measured directly; and 150( f 30) ps for 3 -, 2 and < 30 ps for
4-t 3 are estimated from spectral intensities. A new, much faster relaxation channel, which leads
to B( v= 1, and v=O) is open to states above v= 3 in the B emitting site. This fast channel has
a relaxation time of 7 ( f 1) ps and must involve multiple internal conversions among the nested
electronic states in the ionic manifold. Under intense pumping, the excited population relaxes by
stimulated emission. Stimulated radiative relaxation rates larger than 1.5X 10" s-l are observed
for B(v=O).
1. INTRODUCTION
As the first solid state excimer laser, XeF in solid Ar
has generated interest in recent years.' Although previ-

  

Source: Apkarian, V. Ara - Department of Chemistry, University of California, Irvine

 

Collections: Chemistry